1400002561 has 2 divisors, whose sum is σ = 1400002562. Its totient is φ = 1400002560.

The previous prime is 1400002553. The next prime is 1400002573. The reversal of 1400002561 is 1652000041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 879478336 + 520524225 = 29656^2 + 22815^2 .

It is a cyclic number.

It is not a de Polignac number, because 1400002561 - 2³ = 1400002553 is a prime.

It is not a weakly prime, because it can be changed into another prime (1400006561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700001280 + 700001281.

It is an arithmetic number, because the mean of its divisors is an integer number (700001281).

Almost surely, 2^1400002561 is an apocalyptic number.

It is an amenable number.

1400002561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1400002561 is an equidigital number, since it uses as much as digits as its factorization.

1400002561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1400002561 is about 37416.6080905258. The cubic root of 1400002561 is about 1118.6896242149.

The spelling of 1400002561 in words is "one billion, four hundred million, two thousand, five hundred sixty-one".